.flex {
  display: flex;

  box-sizing: border-box;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;

  box-sizing: border-box;
}

.space {
  flex: 1;
}

[flex-row] {
  flex-direction: row;
}
[flex-column] {
  flex-direction: column;
}

$i: 24;
@while $i > 0 {
  [span="#{$i}"] {
    flex: $i;

    box-sizing: border-box;
  }
  $i: $i - 1;
}

